diff options
Diffstat (limited to 'fs/notify/mark.c')
| -rw-r--r-- | fs/notify/mark.c | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/fs/notify/mark.c b/fs/notify/mark.c index 647c49c20467..b2f5d8c9cce1 100644 --- a/fs/notify/mark.c +++ b/fs/notify/mark.c @@ -106,7 +106,7 @@ static fsnotify_connp_t *fsnotify_object_connp(void *obj, case FSNOTIFY_OBJ_TYPE_VFSMOUNT: return &real_mount(obj)->mnt_fsnotify_marks; case FSNOTIFY_OBJ_TYPE_SB: - return &((struct super_block *)obj)->s_fsnotify_marks; + return fsnotify_sb_marks(obj); default: return NULL; } @@ -569,6 +569,26 @@ int fsnotify_compare_groups(struct fsnotify_group *a, struct fsnotify_group *b) return -1; } +static int fsnotify_attach_info_to_sb(struct super_block *sb) +{ + struct fsnotify_sb_info *sbinfo; + + /* sb info is freed on fsnotify_sb_delete() */ + sbinfo = kzalloc(sizeof(*sbinfo), GFP_KERNEL); + if (!sbinfo) + return -ENOMEM; + + /* + * cmpxchg() provides the barrier so that callers of fsnotify_sb_info() + * will observe an initialized structure + */ + if (cmpxchg(&sb->s_fsnotify_info, NULL, sbinfo)) { + /* Someone else created sbinfo for us */ + kfree(sbinfo); + } + return 0; +} + static int fsnotify_attach_connector_to_object(fsnotify_connp_t *connp, void *obj, unsigned int obj_type) { @@ -640,6 +660,16 @@ static int fsnotify_add_mark_list(struct fsnotify_mark *mark, void *obj, if (WARN_ON(!fsnotify_valid_obj_type(obj_type))) return -EINVAL; + /* + * Attach the sb info before attaching a connector to any object on sb. + * The sb info will remain attached as long as sb lives. + */ + if (!fsnotify_sb_info(sb)) { + err = fsnotify_attach_info_to_sb(sb); + if (err) + return err; + } + connp = fsnotify_object_connp(obj, obj_type); restart: spin_lock(&mark->lock); |